EP0425358A1 - Screwplug, especially for soft material, and tool for installing the same - Google Patents

Screwplug, especially for soft material, and tool for installing the same Download PDF

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Publication number
EP0425358A1
EP0425358A1 EP90402965A EP90402965A EP0425358A1 EP 0425358 A1 EP0425358 A1 EP 0425358A1 EP 90402965 A EP90402965 A EP 90402965A EP 90402965 A EP90402965 A EP 90402965A EP 0425358 A1 EP0425358 A1 EP 0425358A1
Authority
EP
European Patent Office
Prior art keywords
screw according
head
hollow shaft
dowel screw
dowel
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP90402965A
Other languages
German (de)
French (fr)
Other versions
EP0425358B1 (en
Inventor
Jean-Charles Auger
Marc Gosse
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Legrand France SA
Original Assignee
Legrand SA
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Filing date
Publication date
Application filed by Legrand SA filed Critical Legrand SA
Publication of EP0425358A1 publication Critical patent/EP0425358A1/en
Application granted granted Critical
Publication of EP0425358B1 publication Critical patent/EP0425358B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B13/00—Spanners; Wrenches
    • B25B13/48—Spanners; Wrenches for special purposes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B13/00—Dowels or other devices fastened in walls or the like by inserting them in holes made therein for that purpose
    • F16B13/002—Dowels or other devices fastened in walls or the like by inserting them in holes made therein for that purpose self-cutting
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B25/00—Screws that cut thread in the body into which they are screwed, e.g. wood screws
    • F16B25/001—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by the material of the body into which the screw is screwed
    • F16B25/0031—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by the material of the body into which the screw is screwed the screw being designed to be screwed into different materials, e.g. a layered structure or through metallic and wooden parts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B25/00—Screws that cut thread in the body into which they are screwed, e.g. wood screws
    • F16B25/10—Screws performing an additional function to thread-forming, e.g. drill screws or self-piercing screws
    • F16B25/103—Screws performing an additional function to thread-forming, e.g. drill screws or self-piercing screws by means of a drilling screw-point, i.e. with a cutting and material removing action
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B35/00—Screw-bolts; Stay-bolts; Screw-threaded studs; Screws; Set screws
    • F16B35/04—Screw-bolts; Stay-bolts; Screw-threaded studs; Screws; Set screws with specially-shaped head or shaft in order to fix the bolt on or in an object
    • F16B35/06—Specially-shaped heads
    • F16B35/065—Specially-shaped heads with self-countersink-cutting means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B37/00—Nuts or like thread-engaging members
    • F16B37/12—Nuts or like thread-engaging members with thread-engaging surfaces formed by inserted coil-springs, discs, or the like; Independent pieces of wound wire used as nuts; Threaded inserts for holes
    • F16B37/122—Threaded inserts, e.g. "rampa bolts"
    • F16B37/125—Threaded inserts, e.g. "rampa bolts" the external surface of the insert being threaded
    • F16B37/127—Threaded inserts, e.g. "rampa bolts" the external surface of the insert being threaded and self-tapping
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B31/00—Screwed connections specially modified in view of tensile load; Break-bolts
    • F16B31/02—Screwed connections specially modified in view of tensile load; Break-bolts for indicating the attainment of a particular tensile load or limiting tensile load
    • F16B31/021—Screwed connections specially modified in view of tensile load; Break-bolts for indicating the attainment of a particular tensile load or limiting tensile load by means of a frangible part

Definitions

  • the present invention relates generally to screw anchors.
  • screw-plugs screws whose barrel is hollow, this barrel having, as a corollary, in a usual manner, projecting on its outer surface, at least one helical thread suitable for its engagement, by screwing, in any material .
  • interlocking means which the head of these ankle screws have on the front to allow them to be driven in rotation using a tool are conventional interlocking means, in practice a simple diametral bleeding.
  • This arrangement has the advantage of limiting the tightening torque likely to be applied to such a screw to a given maximum value, corresponding to the rupture of these lugs, and therefore of sparing the material with which the barrel of the screw is engaged. -this, especially when it is a soft material.
  • the tightening torque to be applied to the screw so that, by creep of the synthetic material concerned, it makes its way through the part to be fixed may be sufficient to lead to the premature elimination of its frangible lugs , or even, inadvertent shearing of its barrel.
  • the present invention generally relates to a provision which, on the contrary, makes it possible to avoid such a drawback.
  • a peg of the kind comprising a hollow shaft, which has, projecting from its outer surface, at least one helical thread, and a head, which has, on the front, fitting means suitable for allowing the assembly to rotate with the aid of a tool
  • this screw-ankle being generally characterized in that, jointly, on the one hand, the means of fitting that its head has at least one lug, which, projecting from said head, in an eccentric position relative to the axis of said hollow shaft, is frangible, and, on the other hand, the end edge of said hollow shaft opposite said head projecting at least one tooth and thus annularly constitutes a cutter; it also relates to a tool specific to the implementation of such a dowel screw.
  • the cutter formed by the end edge of the screw-plug according to the invention advantageously makes it possible to enlarge the pilot hole made by the tool, and therefore to minimize the screwing torque to be applied to this screw-plug for that its barrel then widens this pilot hole to its own dimensions, thus avoiding a premature rupture of the frangible lugs allowing jointly the drive in rotation of the assembly.
  • the end edge of the hollow barrel of the dowel screw according to the invention can, if desired, extend radially over a width which, starting from the internal surface of this hollow barrel, is greater than that of its current part.
  • the outside diameter of the milling cutter provided according to the invention is then greater than that of the current part of the hollow barrel of which it forms the end.
  • the helical thread of its hollow barrel has firstly a cylindrical surface for its outer envelope, then, in the direction of the end edge of this barrel hollow, a conical surface.
  • the part of the thread whose envelope is a conical surface advantageously allows a progressive deformation, in practice following a slight helix, of the material constituting the part to be fixed, by creep of this material, until then allowing the passage to full diameter of the part, the envelope of which is a cylindrical surface, the latter being responsible for ensuring the mechanical strength of the assembly in the material constituting the support part on which the part to be attached is to stare.
  • the dowel screw 10 comprises a barrel 11 which is hollow, this barrel 11 being hollowed out, axially, by an internal bore opening axially at one and at the other end.
  • the inner surface 12 of this hollow barrel 11 is cylindrical over the entire length thereof, and, in cross section, it has a circular outline.
  • the hollow barrel 11 has, projecting from its outer surface 14, at least one helical thread 15.
  • the head 16 of the dowel screw 10 has, on the front, in a manner known per se, fitting means 17 suitable for allowing the rotational drive of the assembly using a tool.
  • these fitting means 17 comprise at least one lug 18, which, projecting from the head 16, parallel to the axis of the hollow barrel 11, but in the eccentric position by with respect to this axis, is frangible, and, on the other hand, the end edge 19 of this hollow barrel 11, that is to say the end of this hollow barrel 11 opposite the head 16, is present, protruding, parallel to this axis, at least one tooth 20 and thus annularly constitutes a cutter.
  • the end edge 19 of the hollow barrel 11 thus projects a plurality of teeth 20 suitably distributed circularly.
  • teeth 20 are thus provided, which, each extending circularly over 90 °, are regularly distributed circularly.
  • teeth 20 which are all identical to each other, extend radially over the entire width L1 of the end edge 19 which they affect.
  • the teeth 20 are delimited, externally, by a conical surface S1.
  • the half-angle at the apex A1 of this conical surface S1 is of the order of 45 °.
  • the width L1 along which extends radially the end edge 19 of the hollow barrel 11 thus affected by teeth 20, counted from the inner surface 12 of this hollow shaft 11, is greater than that, L2, of the current part thereof.
  • the hollow barrel 11 has, at its end, for the definition of its end edge 19, and from a shoulder 21 located at a distance H1 from the latter, an extra thickness .
  • this distance H1 is only a fraction of the order of, for example, one fifth or one sixth of the height H2 of the hollow barrel 11.
  • the outer surface 14 of the hollow barrel 11 which, moreover, is cylindrical in its part current, and in particular on the side of its end edge 19, widens slightly towards this head 16.
  • the helical thread 15 of the hollow barrel 11 has, firstly, for the outer envelope, and as shown diagrammatically by broken lines in FIG. 2, a cylindrical surface S2, then, in the direction of the edge end 19 of this hollow barrel 11, a conical surface S3.
  • the diameter D2 of the cylindrical surface S2 is substantially equal to twice that, D1, of the outer surface 14 of the hollow barrel 11 in the current part thereof.
  • the helical thread 15 extends in a regular pitch P over the entire height of the hollow barrel 11, and the cylindrical surface S2 extends axially over at least one such pitch P.
  • its half-angle at the apex A3 is preferably of the order of 10 °.
  • the helical thread 15 of the hollow barrel 11 is connected substantially tangentially to the outer surface 14 thereof.
  • this helical thread 15 has an axial section in the form of an isosceles trapezoid.
  • the lower surface 22 of the head 16 is flat, perpendicular to the axis of the hollow shaft 11, and the outer surface 14 thereof is tangentially connected thereto by a broad rounded leave.
  • the upper surface 23 of the head 16 is also flat.
  • fitting means 17 presented by this head 16 comprise two frangible pins 18 arranged in diametrically opposite positions relative to one another.
  • these are lugs with parallel faces, arranged substantially in alignment with one another.
  • the nesting means 17 also include, in these embodiments, a diametrical groove 25, and this extends in a cross with the frangible lugs 18.
  • the tool 26 provided for the implementation of a dowel screw 10 comprises, in combination, on the one hand, a rod 27, which is adapted to be engaged in the internal bore of the hollow barrel 11 of this peg screw 10, and the corresponding end 28 of which comprises at least one cutting edge 29, while its other end 30 forms, beyond a shoulder 31, a six-headed head sections specific to the rotational drive of the assembly, and, on the other hand, arranged annularly around this rod 27, in abutment against the shoulder 31 thereof, a hub 32 having, on its face 33 turned towards the cutting edge end (s) 29 of the rod 27, at least one recess 35 by which it is able to come into engagement with a frangible lug 18 of the peg screw 10.
  • the peg screw 10 comprising two frangible lugs 18, the hub 32 of the tool 26 itself has two recesses 35 arranged in diametrically opposite positions relative to each other.
  • Each of these recesses 35 is in the form of a notch, the edges of which extend substantially radially relative to the axis of the rod 27, and it itself extends around the latter in an angular sector. A2 of the order of 120 °.
  • the rod 27 and the hub 32 form separate parts, duly pressed together with each other.
  • the tool 26 according to the invention could just as easily be produced in one piece.
  • the cutting edge 29 that has the rod 27 at its end 28 preferably extends at an angle A4 of 30 ° relative to a normal to the axis of this rod 27.
  • the rod 27 thus has two cutting edges 29 arranged in opposite positions relative to one another.
  • a part 37 of relatively hard material for example of synthetic material, is attached to a part 38, or support part, of soft material.
  • the part 37 is a chute to be applied by its bottom 39 to the support part 38.
  • this part 38 may be a plasterboard with cardboard faces.
  • the dowel screw 10 As shown in FIG. 11A, the dowel screw 10 according to the invention is engaged on the rod 27 of the tool 26, until its head 16 comes to bear on the edge 33 of the hub 32 thereof. ci, with penetration of its lugs frangible 18 in the recesses 35 affecting the latter.
  • the arrangements are such that the cutting edge end 28 of the rod 27 of the tool 26 then extends widely beyond the end edge 19 of the hollow barrel 11 of the dowel screw 10.
  • the tool 26 being put into action, it ensures, by its cutting edge end 28, the drilling of a pilot hole in the bottom 39 of the part 37 to be fixed and then in the support part 38.
  • the milling cutter which constitutes the end edge 19 of the barrel 11 of the dowel screw 10 then widens this pilot hole, and, by the part of the helical thread 15 whose envelope is a conical surface S3, the dimensions of the latter these are gradually brought to those of the part of this helical thread 15 whose envelope is a cylindrical surface S2.
  • the tool 26 can be re-used, and, by the diametrical groove 25 of its head 16, the previously installed screw-pin 10 can be deposited if desired.
  • the hollow barrel of the dowel screw 10 according to the invention has, radially, the same thickness over its entire height.
  • the outer surface of the hollow barrel is cylindrical over its entire height.
  • the lower surface 22 of the head 16 is frustoconical, and it has, projecting, at least one lug 40, which, in the direction of rotation corresponding to the screwing, has a leading edge 41 tapered into a point, and a trailing edge 42 flat, along a radial plane for the assembly.
  • the internal surface 12 of the hollow barrel 11 is grooved, this internal surface 12 having four cross-sections 43 in the cross.
  • the part 37 to be fixed has in advance a bore 44 for the passage of a screw 45 .
  • the implantation of the peg screw 10 is first carried out in the support part 38, FIG. 12A, according to a process of the same type as that previously described.
  • the screw 45 is then screwed into the internal bore of this dowel screw 10, FIG. 12B, after prior passage of the part to be fixed 37 by this screw 45.
  • the lugs 40 ensure the retention of the peg screw 10 in the support piece 38 during a possible unscrewing of this screw 45.
  • the dowel screw according to the invention may have, duly offset circumferentially with respect to each other, several helical threads.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Dowels (AREA)
  • Hand Tools For Fitting Together And Separating, Or Other Hand Tools (AREA)
  • Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)
  • Food-Manufacturing Devices (AREA)

Abstract

This screwplug is of the type comprising a hollow shank (11) bearing at least one projecting helical thread (15), and a head (16) the surface of which presents insertable means (17) to enable the whole to be turned. According to the invention - the following points being taken together - on the one hand these insertable means (17) comprise at least one stud (18) which, projecting eccentrically from the head (16), is breakable, and on the other hand the extreme portion (19) of the hollow shank (11) has at least one projecting tooth (20) and thus in annular terms constitutes a cutter. Application particularly to screwplugs for soft building materials. <IMAGE>

Description

La présente invention concerne d'une manière générale les vis-chevilles.The present invention relates generally to screw anchors.

Par vis-chevilles, on entend ici des vis dont le fût est creux, ce fût présentant, corollairement, de manière usuelle, en saillie sur sa surface extérieure, au moins un filet hélicoïdal propre à son engagement, par vissage, dans un quelconque matériau.By screw-plugs is meant here screws whose barrel is hollow, this barrel having, as a corollary, in a usual manner, projecting on its outer surface, at least one helical thread suitable for its engagement, by screwing, in any material .

De telles vis à fût creux se trouvent notamment décrites dans les brevets américains Nos 3.289.290 et 4.601.625.Such hollow barrel screws are found in particular in US patents Nos. 3,289,290 and 4,601,625.

Dans le brevet américain No 3.289.290, il s'agit plus précisément d'une vis à mettre directement en oeuvre pour l'assemblage de deux pièces, et l'alésage interne du fût creux de cette vis est mis à profit pour le passage d'un outil de forage propre à la formation d'un avant-trou dans de telles pièces.In US Patent No. 3,289,290, it is more precisely a screw to be used directly for the assembly of two parts, and the internal bore of the hollow barrel of this screw is used for the passage of a drilling tool suitable for the formation of a pilot hole in such parts.

Dans le brevet américain No 4.601.625, il s'agit, au contraire, plus précisément, d'une cheville qui est destinée à être implantée dans une première pièce, en pratique une pièce en matériau tendre, tandis que l'alésage interne de son fût creux est destiné à la mise en oeuvre d'une vis propre à permettre de rapporter une deuxième pièce sur la précédente.In US Patent No. 4,601,625, on the contrary, more specifically, it is a dowel which is intended to be implanted in a first part, in practice a part made of soft material, while the internal bore of its hollow barrel is intended for the implementation of a clean screw to allow a second part to be attached to the previous one.

Dans l'un et l'autre cas, les moyens d'emboîtement que présente en façade la tête de ces vis-chevilles pour en permettre l'entraînement en rotation à l'aide d'un outil sont des moyens d'emboîtement classiques, en pratique une simple saignée diamétrale.In both cases, the interlocking means which the head of these ankle screws have on the front to allow them to be driven in rotation using a tool are conventional interlocking means, in practice a simple diametral bleeding.

Il est connu par ailleurs, par le brevet américain No 4.109.691, qui reprend à cet égard des dispositions décrites pour un écrou dans le brevet américain No 3.460.428, de doter la tête d'une vis, dont le fût est plein, de moyens d'emboîtement qui, destinés eux aussi à en permettre l'entraînement en rotation par un outil, se présentent sous la forme d'ergots frangibles.It is also known, by American patent No 4,109,691, which takes up in this respect the provisions described for a nut in American patent No 3,460,428, to endow the head with a screw, the barrel of which is full, nesting means which, also intended to allow it to be driven in rotation by a tool, are in the form of frangible lugs.

Cette disposition a pour avantage de limiter à une valeur maximale donnée, correspondant à la rupture de ces ergots, le couple de serrage susceptible d'être appliqué à une telle vis, et donc de ménager le matériau avec lequel est en prise le fût de celle-ci, notamment lorsqu'il s'agit d'un matériau tendre.This arrangement has the advantage of limiting the tightening torque likely to be applied to such a screw to a given maximum value, corresponding to the rupture of these lugs, and therefore of sparing the material with which the barrel of the screw is engaged. -this, especially when it is a soft material.

Mais elle se trouve en défaut si, préalablement à son engagement dans une pièce en un tel matériau tendre, formant pièce de support, la vis doit traverser, pour la fixer sur la précédente, une pièce en matériau plus dur ne présentant pas par avance de perçage propre à son passage, comme cela peut par exemple être le cas d'une quelconque pièce en matière synthétique à fixer en un quelconque de ses points à une plaque en plâtre ou analogue, et, par exemple, à une plaque en plâtre du type de celle dont chacune des faces est cartonnée.But it is in default if, prior to its engagement in a part made of such a soft material, forming a support part, the screw must pass through, to fix it on the previous one, a part made of harder material not having in advance of drilling proper to its passage, as may for example be the case of any piece of synthetic material to be fixed at any of its points to a plasterboard or the like, and, for example, to a plasterboard of the type that of which each of the faces is cardboard.

Dans un tel cas, le couple de serrage à appliquer à la vis pour que, par fluage de la matière synthétique concernée, elle se fraye un passage à travers la pièce à fixer peut être suffisant pour conduire à l'élimination prématurée de ses ergots frangibles, voire, même, à un cisaillage intempestif de son fût.In such a case, the tightening torque to be applied to the screw so that, by creep of the synthetic material concerned, it makes its way through the part to be fixed may be sufficient to lead to the premature elimination of its frangible lugs , or even, inadvertent shearing of its barrel.

La présente invention a d'une manière générale pour objet une disposition permettant au contraire d'éviter un tel inconvénient.The present invention generally relates to a provision which, on the contrary, makes it possible to avoid such a drawback.

De manière plus précise, elle a tout d'abord pour objet une vis-cheville du genre comportant un fût creux, qui présente, en saillie sur sa surface extérieure, au moins un filet hélicoïdal, et une tête, qui présente, en façade, des moyens d'emboîtement propres à permettre l'entraînement en rotation de l'ensemble à l'aide d'un outil, cette vis-­cheville étant d'une manière générale caractérisée en ce que, conjointement, d'une part, les moyens d'emboîtement que présente sa tête comportent au moins un ergot, qui, en saillie sur ladite tête, en position excentrée par rapport à l'axe dudit fût creux, est frangible, et, d'autre part, la tranche d'extrémité dudit fût creux opposée à ladite tête présente en saillie au moins une dent et constitue ainsi annulairement une fraise ; elle a encore pour objet un outil propre à la mise en oeuvre d'une telle vis-cheville.More specifically, it firstly relates to a peg of the kind comprising a hollow shaft, which has, projecting from its outer surface, at least one helical thread, and a head, which has, on the front, fitting means suitable for allowing the assembly to rotate with the aid of a tool, this screw-ankle being generally characterized in that, jointly, on the one hand, the means of fitting that its head has at least one lug, which, projecting from said head, in an eccentric position relative to the axis of said hollow shaft, is frangible, and, on the other hand, the end edge of said hollow shaft opposite said head projecting at least one tooth and thus annularly constitutes a cutter; it also relates to a tool specific to the implementation of such a dowel screw.

La fraise que forme la tranche d'extrémité de la vis-cheville suivant l'invention permet avantageusement d'agrandir l'avant-trou pratiqué par l'outil, et donc de minimiser le couple de vissage à appliquer à cette vis-cheville pour que son fût élargisse ensuite à ses propres dimemsions cet avant-trou, en évitant ainsi une rupture prématurée des ergots frangibles permettant conjointement l'entraînement en rotation de l'ensemble.The cutter formed by the end edge of the screw-plug according to the invention advantageously makes it possible to enlarge the pilot hole made by the tool, and therefore to minimize the screwing torque to be applied to this screw-plug for that its barrel then widens this pilot hole to its own dimensions, thus avoiding a premature rupture of the frangible lugs allowing jointly the drive in rotation of the assembly.

Pour minimiser encore ce couple de vissage, la tranche d'extrémité du fût creux de la vis-cheville suivant l'invention peut, si désiré, s'étendre radialement sur une largeur qui, à compter de la surface intérieure de ce fût creux, est supérieure à celle de sa partie courante.To further minimize this screwing torque, the end edge of the hollow barrel of the dowel screw according to the invention can, if desired, extend radially over a width which, starting from the internal surface of this hollow barrel, is greater than that of its current part.

Autrement dit, le diamètre extérieur de la fraise prévue suivant l'invention est alors supérieur à celui de la partie courant du fût creux dont elle forme l'extrémité.In other words, the outside diameter of the milling cutter provided according to the invention is then greater than that of the current part of the hollow barrel of which it forms the end.

De préférence, également, à compter de la tête de la vis-cheville suivant l'invention le filet hélicoïdal de son fût creux a d'abord pour enveloppe extérieure une surface cylindrique, puis, en direction de la tranche d'extrémité de ce fût creux, une surface conique.Preferably also, from the head of the dowel screw according to the invention, the helical thread of its hollow barrel has firstly a cylindrical surface for its outer envelope, then, in the direction of the end edge of this barrel hollow, a conical surface.

Ainsi, la partie du filet dont l'enveloppe est une surface conique permet avantageusement une déformation progressive, en pratique suivant une légère hélice, du matériau constitutif de la pièce à fixer, par fluage de ce matériau, jusqu'à permettre ensuite le passage à plein diamètre de la partie dont l'enveloppe est une surface cylindrique, celle-ci, ayant, elle à charge d'assurer la tenue mécanique de l'ensemble dans le matériau constitutif de la pièce de support sur laquelle doit être rapportée la pièce à fixer.Thus, the part of the thread whose envelope is a conical surface advantageously allows a progressive deformation, in practice following a slight helix, of the material constituting the part to be fixed, by creep of this material, until then allowing the passage to full diameter of the part, the envelope of which is a cylindrical surface, the latter being responsible for ensuring the mechanical strength of the assembly in the material constituting the support part on which the part to be attached is to stare.

Ainsi, dans le cas où, comme indiqué à titre d'exemple, bien entendu non limitatif, doivent être prises en considération une pièce de support en matériau tendre et une pièce à fixer en matériau plus dur, un compromis particulièrement avantageux est trouvé entre le travail nécessaire à la traversée de la pièce en matériau plus dur et celui correspondant à l'implantation de l'ensemble dans la pièce en matériau tendre.Thus, in the case where, as indicated by way of example, of course not limiting, must be taken into consideration a support piece of soft material and a piece to be fixed in harder material, a particularly advantageous compromise is found between the work required to cross the piece of harder material and that corresponding to the installation of the assembly in the piece of soft material.

Les caractéristiques et avantages de l'invention ressortiront d'ailleurs de la description qui va suivre, à titre d'exemple, en référence aux dessins schématiques annexés sur lesquels :

  • la figure 1 est une vue en élévation d'une vis-cheville suivant l'invention ;
  • la figure 2 en est une vue en coupe axiale, suivant la ligne II-II de la figure 1 ;
  • la figure 3 en est une vue de dessus, suivant la flèche III de la figure 1 ;
  • la figure 4 en est une vue de dessous, suivant la flèche IV de la figure 1 ;
  • la figure 5 reprend, à échelle supérieure, le détail de la figure 2 repéré par un encart V sur cette figure 2 ;
  • la figure 6 est une vue en perspective d'un outil propre à la mise en oeuvre de la vis-cheville suivant l'invention ;
  • la figure 7 est une vue, partie en élévation, et, à la faveur d'un arrachement, partie en coupe axiale, suivant la ligne VII-VII de la figure 6, de cet outil ;
  • la figure 8 en est une première vue de bout, suivant la flèche VIII de la figure 7 ;
  • la figure 9 en est une deuxième vue de bout, suivant la flèche IX de la figure 7 ;
  • la figure 10 en est une vue partielle en plan, suivant la flèche X de la figure 7 ;
  • les figures 11A, 11B et 11C sont, à échelle inférieure, des vues en coupe axiale illustrant diverses phases successives de la mise en oeuvre d'une vis-cheville suivant l'invention ;
  • la figure 12 est, avec un arrachement local, une vue en élévation analogue à celle de la figure 1, pour une variante de réalisation de la vis-cheville suivant l'invention ;
  • la figure 13 est une vue en coupe transversale de cette variante de réalisation, suivant la ligne XIII-XIII de la figure 12 ;
  • les figures 14A et 14B sont des vues en coupe axiale, qui, à la manière des figures 11A, 11B et 11C, illustrent diverses phases successives de la mise en oeuvre de cette variante de réalisation.
The characteristics and advantages of the invention will become apparent from the description which follows, by way of example, with reference to the appended schematic drawings in which:
  • Figure 1 is an elevational view of a dowel screw according to the invention;
  • Figure 2 is an axial sectional view along the line II-II of Figure 1;
  • Figure 3 is a top view, along arrow III of Figure 1;
  • Figure 4 is a bottom view, along arrow IV of Figure 1;
  • Figure 5 shows, on a larger scale, the detail of Figure 2 identified by an insert V in this Figure 2;
  • Figure 6 is a perspective view of a tool specific to the implementation of the dowel screw according to the invention;
  • Figure 7 is a view, partly in elevation, and, with the help of a cutaway, part in axial section, along the line VII-VII of Figure 6, of this tool;
  • Figure 8 is a first end view, along arrow VIII of Figure 7;
  • Figure 9 is a second end view, along arrow IX of Figure 7;
  • Figure 10 is a partial plan view, along arrow X of Figure 7;
  • FIGS. 11A, 11B and 11C are, on a smaller scale, views in axial section illustrating various phases successive to the implementation of a dowel screw according to the invention;
  • Figure 12 is, with a local cutaway, an elevational view similar to that of Figure 1, for an alternative embodiment of the screw anchor according to the invention;
  • Figure 13 is a cross-sectional view of this alternative embodiment, along the line XIII-XIII of Figure 12;
  • Figures 14A and 14B are views in axial section, which, like Figures 11A, 11B and 11C, illustrate various successive phases of the implementation of this alternative embodiment.

Tel qu'illustré sur ces figures, et de manière connue en soi, la vis-cheville 10 suivant l'invention comporte un fût 11 qui est creux, ce fût 11 étant évidé, axialement, par un alésage interne débouchant axialement à l'une et à l'autre de ses extrémités.As illustrated in these figures, and in a manner known per se, the dowel screw 10 according to the invention comprises a barrel 11 which is hollow, this barrel 11 being hollowed out, axially, by an internal bore opening axially at one and at the other end.

En pratique, dans la forme de réalisation plus particulièrement représentée sur les figures 1 à 5, la surface intérieure 12 de ce fût creux 11 est cylindrique sur toute la longueur de celui-ci, et, en section transversale, elle a un contour circulaire.In practice, in the embodiment more particularly shown in Figures 1 to 5, the inner surface 12 of this hollow barrel 11 is cylindrical over the entire length thereof, and, in cross section, it has a circular outline.

De manière également connue en soi, le fût creux 11 présente, en saillie, sur sa surface extérieure 14, au moins un filet hélicoïdal 15.In a manner also known per se, the hollow barrel 11 has, projecting from its outer surface 14, at least one helical thread 15.

Corollairement, la tête 16 de la vis-cheville 10 suivant l'invention présente, en façade, de manière connue en soi, des moyens d'emboîtement 17 propres à permettre l'entraînement en rotation de l'ensemble à l'aide d'un outil.As a corollary, the head 16 of the dowel screw 10 according to the invention has, on the front, in a manner known per se, fitting means 17 suitable for allowing the rotational drive of the assembly using a tool.

Suivant l'invention, et conjointement, d'une part, ces moyens d'emboîtement 17 comportent au moins un ergot 18, qui, en saillie sur la tête 16, parallèlement à l'axe du fût creux 11, mais en position excentrée par rapport à cet axe, est frangible, et, d'autre part, la tranche d'extrémité 19 de ce fût creux 11, c'est-à-dire l'extrémité de ce fût creux 11 opposée à la tête 16, présente, en saillie, parallèlement à cet axe, au moins une dent 20 et constitue ainsi annulairement une fraise.According to the invention, and jointly, on the one hand, these fitting means 17 comprise at least one lug 18, which, projecting from the head 16, parallel to the axis of the hollow barrel 11, but in the eccentric position by with respect to this axis, is frangible, and, on the other hand, the end edge 19 of this hollow barrel 11, that is to say the end of this hollow barrel 11 opposite the head 16, is present, protruding, parallel to this axis, at least one tooth 20 and thus annularly constitutes a cutter.

De préférence, et tel que représenté, la tranche d'extrémité 19 du fût creux 11 présente ainsi en saillie plusieurs dents 20 convenablement réparties circulairement.Preferably, and as shown, the end edge 19 of the hollow barrel 11 thus projects a plurality of teeth 20 suitably distributed circularly.

Dans les formes de réalisation représentées, quatre dents 20 sont ainsi prévues, qui, s'étendant chacune circulairement sur 90°, sont régulièrement réparties circulairement.In the embodiments shown, four teeth 20 are thus provided, which, each extending circularly over 90 °, are regularly distributed circularly.

Ces dents 20, qui sont toutes identiques entre elles, s'étendent radialement sur toute la largeur L1 de la tranche d'extrémité 19 qu'elles affectent.These teeth 20, which are all identical to each other, extend radially over the entire width L1 of the end edge 19 which they affect.

Elles présentent, en outre, toutes, et toutes dans le même sens, suivant le sens de rotation à appliquer à l'ensemble pour un vissage, un flanc raide et un flanc en pente douce, à la manière, usuelle, d'un outil.They have, in addition, all, and all in the same direction, according to the direction of rotation to be applied to the assembly for a screwing, a stiff flank and a gently sloping flank, in the usual way of a tool .

Dans les formes de réalisation représentées, les dents 20 sont délimitées, extérieurement, par une surface conique S1.In the embodiments shown, the teeth 20 are delimited, externally, by a conical surface S1.

De préférence, et tel que représenté, le demi-angle au sommet A1 de cette surface conique S1 est de l'ordre de 45°.Preferably, and as shown, the half-angle at the apex A1 of this conical surface S1 is of the order of 45 °.

Dans la forme de réalisation plus particulièrement représentée sur les figures 1 à 5, la largeur L1 suivant laquelle s'étend radialement la tranche d'extrémité 19 du fût creux 11 ainsi affectée de dents 20, comptée à partir de la surface intérieure 12 de ce fût creux 11, est supérieure à celle, L2, de la partie courante de celui-ci.In the embodiment more particularly shown in Figures 1 to 5, the width L1 along which extends radially the end edge 19 of the hollow barrel 11 thus affected by teeth 20, counted from the inner surface 12 of this hollow shaft 11, is greater than that, L2, of the current part thereof.

Autrement dit, dans cette forme de réalisation, le fût creux 11 présente, à son extrémité, pour la définition de sa tranche d'extrémité 19, et à compter d'un épaulement 21 situé à une distance H1 de celle-ci, une surépaisseur.In other words, in this embodiment, the hollow barrel 11 has, at its end, for the definition of its end edge 19, and from a shoulder 21 located at a distance H1 from the latter, an extra thickness .

En pratique, cette distance H1 n'est qu'une fraction de l'ordre par exemple du cinquième ou du sixième de la hauteur H2 du fût creux 11.In practice, this distance H1 is only a fraction of the order of, for example, one fifth or one sixth of the height H2 of the hollow barrel 11.

Du côté de la tête 16, la surface extérieure 14 du fût creux 11, qui, par ailleurs, est cylindrique dans sa partie courante, et notamment du côté de sa tranche d'extrémité 19, va en s'évasant légèrement en direction de cette tête 16.On the side of the head 16, the outer surface 14 of the hollow barrel 11, which, moreover, is cylindrical in its part current, and in particular on the side of its end edge 19, widens slightly towards this head 16.

La partie courante du fût creux 11, c'est-à-dire la partie de celui-ci située entre la portion évasée de sa surface extérieure 14 et son extrémité surépaissie, a donc, radialement, une épaisseur constante.The current part of the hollow barrel 11, that is to say the part thereof located between the flared portion of its outer surface 14 and its thickened end, therefore has, radially, a constant thickness.

Il en est de même de son extrémité surépaissie.The same is true of its thickened end.

A compter de la tête 16, le filet hélicoïdal 15 du fût creux 11 a, d'abord, pour enveloppe extérieure, et tel que schématisé par des traits interrompus sur la figure 2, une surface cylindrique S2, puis, en direction de la tranche d'extrémité 19 de ce fût creux 11, une surface conique S3.From the head 16, the helical thread 15 of the hollow barrel 11 has, firstly, for the outer envelope, and as shown diagrammatically by broken lines in FIG. 2, a cylindrical surface S2, then, in the direction of the edge end 19 of this hollow barrel 11, a conical surface S3.

De préférence, le diamètre D2 de la surface cylindrique S2 est sensiblement égal au double de celui, D1, de la surface extérieure 14 du fût creux 11 dans la partie courante de celle-ci.Preferably, the diameter D2 of the cylindrical surface S2 is substantially equal to twice that, D1, of the outer surface 14 of the hollow barrel 11 in the current part thereof.

De préférence, également, le filet hélicoïdal 15 s'étend suivant un pas régulier P sur toute la hauteur du fût creux 11, et la surface cylindrique S2 s'étend axialement sur au moins un tel pas P.Preferably also, the helical thread 15 extends in a regular pitch P over the entire height of the hollow barrel 11, and the cylindrical surface S2 extends axially over at least one such pitch P.

Quant à la surface conique S3, son demi-angle au sommet A3 est de préférence de l'ordre de 10°.As for the conical surface S3, its half-angle at the apex A3 is preferably of the order of 10 °.

A son extrémité, c'est-à-dire à l'extrémité de la surface conique S3, le filet hélicoïdal 15 du fût creux 11 se raccorde sensiblement tangentiellement à la surface extérieure 14 de celui-ci.At its end, that is to say at the end of the conical surface S3, the helical thread 15 of the hollow barrel 11 is connected substantially tangentially to the outer surface 14 thereof.

De préférence, et tel que représenté, ce filet hélicoïdal 15 a une section axiale en forme de trapèze isocèle.Preferably, and as shown, this helical thread 15 has an axial section in the form of an isosceles trapezoid.

L'inclinaison I, sur une médiane de l'ensemble, de chacun des côtés de cette section axiale en trapèze isocèle est de l'ordre de 20°.The inclination I, on a median of the assembly, of each of the sides of this axial section in an isosceles trapezoid is of the order of 20 °.

Le long de la surface conique S3, la petite base de section axiale en trapèze isocèle, qui est inclinée à l'image de la génératrice de celle-ci, reste sensiblement la même.Along the conical surface S3, the small base of axial section in an isosceles trapezoid, which is inclined like the generator thereof, remains substantially the same.

Seule diminue donc peu à peu, en direction de la tranche d'extrémité 19 du fût creux 11, la grande base de cette section axiale en trapèze isocèle.Only therefore gradually decreases, towards the end edge 19 of the hollow shaft 11, the large base of this axial section in an isosceles trapezoid.

Dans la forme de réalisation plus particulièrement représentée sur les figures 1 à 5, la surface inférieure 22 de la tête 16 est plate, perpendiculairement à l'axe du fût creux 11, et la surface extérieure 14 de celui-ci s'y raccorde tangentiellement par un large congé arrondi.In the embodiment more particularly shown in Figures 1 to 5, the lower surface 22 of the head 16 is flat, perpendicular to the axis of the hollow shaft 11, and the outer surface 14 thereof is tangentially connected thereto by a broad rounded leave.

Dans cette forme de réalisation, et il en est de même dans la variante de réalisation représentée sur les figures 12, 13, la surface supérieure 23 de la tête 16 est également plate.In this embodiment, and it is the same in the alternative embodiment shown in Figures 12, 13, the upper surface 23 of the head 16 is also flat.

En pratique, les moyens d'emboîtement 17 que présente cette tête 16 comportent deux ergots frangibles 18 disposés en positions diamétralement opposées l'un par rapport à l'autre.In practice, the fitting means 17 presented by this head 16 comprise two frangible pins 18 arranged in diametrically opposite positions relative to one another.

Il s'agit, dans les formes de réalisation représentées, d'ergots à faces parallèles, disposés sensiblement dans l'alignement l'un de l'autre.In the embodiments shown, these are lugs with parallel faces, arranged substantially in alignment with one another.

Les moyens d'emboîtement 17 comportent également, dans ces formes de réalisation, une saignée diamétrale 25, et celle-ci s'étend en croix avec les ergots frangibles 18.The nesting means 17 also include, in these embodiments, a diametrical groove 25, and this extends in a cross with the frangible lugs 18.

Tel que représenté à la figure 6, l'outil 26 prévu pour la mise en oeuvre d'une vis-cheville 10 suivant l'invention comporte, en combinaison, d'une part, une tige 27, qui est propre à être engagée dans l'alésage interne du fût creux 11 de cette vis-cheville 10, et dont l'extrémité 28 correspondante comporte au moins un tranchant 29, tandis que son autre extrémité 30 forme, au-delà d'un épaulement 31, une tête à six pans propre à l'entraînement en rotation de l'ensemble, et, d'autre part, disposé annulairement autour de cette tige 27, en butée contre l'épaulement 31 de celle-ci, un moyeu 32 présentant, sur sa tranche 33 tournée vers l'extrémité 28 à tranchant(s) 29 de la tige 27, au moins un évidement 35 par lequel il est apte à venir en prise avec un ergot frangible 18 de la vis-cheville 10.As shown in Figure 6, the tool 26 provided for the implementation of a dowel screw 10 according to the invention comprises, in combination, on the one hand, a rod 27, which is adapted to be engaged in the internal bore of the hollow barrel 11 of this peg screw 10, and the corresponding end 28 of which comprises at least one cutting edge 29, while its other end 30 forms, beyond a shoulder 31, a six-headed head sections specific to the rotational drive of the assembly, and, on the other hand, arranged annularly around this rod 27, in abutment against the shoulder 31 thereof, a hub 32 having, on its face 33 turned towards the cutting edge end (s) 29 of the rod 27, at least one recess 35 by which it is able to come into engagement with a frangible lug 18 of the peg screw 10.

Dans la forme de réalisation représentée, la vis-cheville 10 comportant deux ergots frangibles 18, le moyeu 32 de l'outil 26 présente lui-même deux évidements 35 disposés en positions diamétralement opposées l'un par rapport à l'autre.In the embodiment shown, the peg screw 10 comprising two frangible lugs 18, the hub 32 of the tool 26 itself has two recesses 35 arranged in diametrically opposite positions relative to each other.

Chacun de ces évidements 35 se présente sous la forme d'une échancrure dont les bords s'étendent sensiblement radialement par rapport à l'axe de la tige 27, et il s'étend lui-même autour de celle-ci suivant un secteur angulaire A2 de l'ordre de 120°.Each of these recesses 35 is in the form of a notch, the edges of which extend substantially radially relative to the axis of the rod 27, and it itself extends around the latter in an angular sector. A2 of the order of 120 °.

Dans la forme de réalisation représentée, la tige 27 et le moyeu 32 forment des pièces distinctes, dûment emmanchées à force l'une avec l'autre.In the embodiment shown, the rod 27 and the hub 32 form separate parts, duly pressed together with each other.

Mais, en variante, l'outil 26 suivant l'invention pourrait tout aussi bien être réalisé d'un seul tenant.However, as a variant, the tool 26 according to the invention could just as easily be produced in one piece.

Quoi qu'il en soit, formé à la faveur d'une double troncature, suivant deux plans inclinés qui se rapprochent l'un de l'autre en s'éloignant du moyeu 32, le tranchant 29 que présente la tige 27 à son extrémité 28 s'étend de préférence suivant un angle A4 de 30° par rapport à une normale à l'axe de cette tige 27.Anyway, formed by means of a double truncation, following two inclined planes which approach each other away from the hub 32, the cutting edge 29 that has the rod 27 at its end 28 preferably extends at an angle A4 of 30 ° relative to a normal to the axis of this rod 27.

En pratique, la tige 27 présente ainsi deux tranchants 29 disposés en positions opposées l'un par rapport à l'autre.In practice, the rod 27 thus has two cutting edges 29 arranged in opposite positions relative to one another.

Dans l'application illustrée par les figures 11A, 11B, 11C, il est supposé qu'une pièce 37 en matériau relativement dur, en matière synthétique par exemple, est rapportée sur une pièce 38, ou pièce de support, en matériau tendre.In the application illustrated by FIGS. 11A, 11B, 11C, it is assumed that a part 37 of relatively hard material, for example of synthetic material, is attached to a part 38, or support part, of soft material.

Par exemple, la pièce 37 est une goulotte à appliquer par son fond 39 sur la pièce de support 38.For example, the part 37 is a chute to be applied by its bottom 39 to the support part 38.

Quant à cette pièce 38, il peut s'agir d'une plaque de plâtre à faces cartonnées.As for this part 38, it may be a plasterboard with cardboard faces.

Tel que représenté à la figure 11A, la vis-cheville 10 suivant l'invention est engagée sur la tige 27 de l'outil 26, jusqu'à ce que sa tête 16 vienne en appui sur la tranche 33 du moyeu 32 de celui-ci, avec pénétration de ses ergots frangibles 18 dans les évidements 35 affectant cette dernière.As shown in FIG. 11A, the dowel screw 10 according to the invention is engaged on the rod 27 of the tool 26, until its head 16 comes to bear on the edge 33 of the hub 32 thereof. ci, with penetration of its lugs frangible 18 in the recesses 35 affecting the latter.

Ainsi qu'il est aisé de le comprendre, l'extension circulaire relativement grande de ces évidements 35 facilite cette pénétration.As is easy to understand, the relatively large circular extension of these recesses 35 facilitates this penetration.

Par construction, les dispositions sont telles que l'extrémité 28 à tranchants 29 de la tige 27 de l'outil 26 s'étend alors largement au-delà de la tranche d'extrémité 19 du fût creux 11 de la vis-cheville 10.By construction, the arrangements are such that the cutting edge end 28 of the rod 27 of the tool 26 then extends widely beyond the end edge 19 of the hollow barrel 11 of the dowel screw 10.

L'outil 26 étant mis en action, il assure, par son extrémité 28 à tranchants 29, le perçage d'un avant-trou dans le fond 39 de la pièce 37 à fixer puis dans la pièce de support 38.The tool 26 being put into action, it ensures, by its cutting edge end 28, the drilling of a pilot hole in the bottom 39 of the part 37 to be fixed and then in the support part 38.

La fraise que constitue la tranche d'extrémité 19 du fût 11 de la vis-cheville 10 élargit ensuite cet avant-trou, et, par la partie du filet hélicoïdal 15 dont l'enveloppe est une surface conique S3, les dimensions de celui-ci sont progressivement portées à celles de la partie de ce filet hélicoïdal 15 dont l'enveloppe est une surface cylindrique S2.The milling cutter which constitutes the end edge 19 of the barrel 11 of the dowel screw 10 then widens this pilot hole, and, by the part of the helical thread 15 whose envelope is a conical surface S3, the dimensions of the latter these are gradually brought to those of the part of this helical thread 15 whose envelope is a cylindrical surface S2.

Au terme de la pénétration totale de la vis-cheville 10 dans la pièce 37 et dans la pièce 38, les ergots frangibles 18 de cette vis-cheville 10 viennent à se casser.At the end of the total penetration of the peg screw 10 in the part 37 and in the part 38, the frangible lugs 18 of this peg screw 10 come to break.

La fixation de l'ensemble est alors terminée, figure 11C.The attachment of the assembly is then completed, FIG. 11C.

Bien entendu, l'outil 26 peut resservir, et, par la saignée diamétrale 25 de sa tête 16, la vis-cheville 10 précédemment mise en place peut si désiré être déposée.Of course, the tool 26 can be re-used, and, by the diametrical groove 25 of its head 16, the previously installed screw-pin 10 can be deposited if desired.

Suivant la variante de réalisation illustrée par les figures 12 et 13, le fût creux de la vis-cheville 10 suivant l'invention a, radialement, une même épaisseur sur toute sa hauteur.According to the variant embodiment illustrated in FIGS. 12 and 13, the hollow barrel of the dowel screw 10 according to the invention has, radially, the same thickness over its entire height.

Autrement dit, dans cette variante de réalisation, il ne présente pas de surépaisseur à son extrémité.In other words, in this alternative embodiment, it does not have any excess thickness at its end.

En outre, dans cette variante de réalisation, la surface extérieure du fût creux est cylindrique sur toute sa hauteur.In addition, in this alternative embodiment, the outer surface of the hollow barrel is cylindrical over its entire height.

De plus, la surface inférieure 22 de la tête 16 est tronconique, et elle présente, en saillie, au moins un ergot 40, qui, dans le sens de rotation correspondant au vissage, comporte un bord d'attaque 41 effilé en pointe, et un bord de fuite 42 plat, suivant un plan radial pour l'ensemble.In addition, the lower surface 22 of the head 16 is frustoconical, and it has, projecting, at least one lug 40, which, in the direction of rotation corresponding to the screwing, has a leading edge 41 tapered into a point, and a trailing edge 42 flat, along a radial plane for the assembly.

En pratique, dans la forme de réalisation représentée, quatre ergots 40, régulièrement répartis circulairement, sont prévus.In practice, in the embodiment shown, four pins 40, regularly distributed circularly, are provided.

Enfin, dans cette variante de réalisation, la surface intérieure 12 du fût creux 11 est cannelée, cette surface intérieure 12 comportant en croix, quatre méplats 43.Finally, in this variant embodiment, the internal surface 12 of the hollow barrel 11 is grooved, this internal surface 12 having four cross-sections 43 in the cross.

Pour le reste, les dispositions sont du type de celles décrites précédemment.For the rest, the provisions are of the type described above.

Dans l'application illustrée par les figures 14A et 14B, à laquelle la variante de réalisation représentée sur les figures 12, 13 précédentes est plus particulièrement destinée, la pièce 37 à fixer présente par avance un perçage 44 pour le passage d'une vis 45.In the application illustrated by FIGS. 14A and 14B, for which the alternative embodiment shown in FIGS. 12 and 13 above is more particularly intended, the part 37 to be fixed has in advance a bore 44 for the passage of a screw 45 .

Dans ce cas, il est d'abord procédé à l'implantation de la vis-cheville 10 dans la pièce de support 38, figure 12A, suivant un processus du même type que celui précédemment décrit.In this case, the implantation of the peg screw 10 is first carried out in the support part 38, FIG. 12A, according to a process of the same type as that previously described.

Au terme de ce processus, sa tête 16 vient s'ancrer, avec ses ergots 40, dans la pièce de support 38.At the end of this process, its head 16 is anchored, with its pins 40, in the support piece 38.

Il est procédé ensuite au vissage de la vis 45 dans l'alésage interne de cette vis-cheville 10, figure 12B, après traversée préalable de la pièce à fixer 37 par cette vis 45.The screw 45 is then screwed into the internal bore of this dowel screw 10, FIG. 12B, after prior passage of the part to be fixed 37 by this screw 45.

Ainsi qu'il est aisé de le comprendre, du fait de la configuration cannelée de la surface intérieure 12 du fût creux 11, le couple de vissage nécessaire au vissage de cette vis 45 est avantageusement réduit.As is easy to understand, due to the grooved configuration of the inner surface 12 of the hollow barrel 11, the tightening torque necessary for the screwing of this screw 45 is advantageously reduced.

Quant aux ergots 40, ils assurent la retenue de la vis-cheville 10 dans la pièce de support 38 lors d'un éventuel dévissage de cette vis 45.As for the lugs 40, they ensure the retention of the peg screw 10 in the support piece 38 during a possible unscrewing of this screw 45.

Bien entendu, la présente invention ne se limite pas aux formes de réalisation décrites et représentées, mais englobe toute variante d'exécution et/ou de combinaison de leurs divers éléments.Of course, the present invention is not limited to the embodiments described and shown, but includes any variant and / or combination of their various elements.

En particulier, la vis-cheville suivant l'invention peut présenter, dûment décalés circonférentiellement les uns par rapport aux autres, plusieurs filets hélicoïdaux.In particular, the dowel screw according to the invention may have, duly offset circumferentially with respect to each other, several helical threads.

Claims (27)

1. Vis-cheville du genre comportant un fût creux (11), qui présente, en saillie sur sa surface extérieure, au moins un filet hélicoïdal (15), et une tête (16), qui présente, en façade, des moyens d'emboîtement (17) propres à permettre l'entraînement en rotation de l'ensemble à l'aide d'un outil, caractérisée en ce que, conjointement, d'une part, les moyens d'emboîtement (17) que présente sa tête (16) comportent au moins un ergot (18), qui, en saillie sur ladite tête (16), en position excentrée par rapport à l'axe de son fût creux (11), est frangible, et, d'autre part, la tranche d'extrémité (19) dudit fût creux (11) présente en saillie au moins une dent (20) et constitue ainsi annulairement une fraise.1. Ankle screw of the kind comprising a hollow barrel (11), which has, projecting from its outer surface, at least one helical thread (15), and a head (16), which has, on the front, means for 'fitting (17) adapted to allow the rotational drive of the assembly using a tool, characterized in that, jointly, on the one hand, the fitting means (17) that has its head (16) comprise at least one lug (18), which, projecting from said head (16), in an eccentric position relative to the axis of its hollow shaft (11), is frangible, and, on the other hand, the end edge (19) of said hollow barrel (11) projecting at least one tooth (20) and thus constitutes an annular cutter. 2. Vis-cheville suivant la revendication 1, caractérisée en ce que la tranche d'extrémité (19) de son fût creux (11) présente en saillie plusieurs dents (20) réparties circulairement.2. Ankle screw according to claim 1, characterized in that the end edge (19) of its hollow shaft (11) has projecting several teeth (20) distributed circularly. 3. Vis-cheville suivant la revendication 2, caractérisée en ce que les dents (20) de la tranche d'extrémité (19) de son fût creux (11) s'étendent radialement sur toute la largeur (L1) de celle-ci.3. Dowel screw according to claim 2, characterized in that the teeth (20) of the end edge (19) of its hollow shaft (11) extend radially over the entire width (L1) thereof . 4. Vis-cheville suivant l'une quelconque des revendications 2, 3, caractérisée en ce que la tranche d'extrémité (19) de son fût creux (11) s'étend radialement sur une largeur (L1), qui, à compter de sa surface intérieure (12) est supérieure à celle (L2) de sa partie courante.4. Dowel screw according to any one of claims 2, 3, characterized in that the end edge (19) of its hollow shaft (11) extends radially over a width (L1), which, from of its inner surface (12) is greater than that (L2) of its current part. 5. Vis-cheville suivant l'une quelconque des revendications 2 à 4, caractérisée en ce que les dents (20) de la tranche d'extrémité (19) de son fût creux (11) sont délimitées extérieurement par une surface conique (S1).5. Dowel screw according to any one of claims 2 to 4, characterized in that the teeth (20) of the end edge (19) of its hollow shaft (11) are delimited externally by a conical surface (S1 ). 6. Vis-cheville suivant la revendication 5, caractérisée en ce que le demi-angle au sommet (A1) de ladite surface conique (S1) est de l'ordre de 45°.6. Dowel screw according to claim 5, characterized in that the half-angle at the top (A1) of said conical surface (S1) is of the order of 45 °. 7. Vis-cheville suivant l'une quelconque des revendications 1 à 6, caractérisée en ce que, à compter de sa tête (16), le filet hélicoïdal (15) de son fût creux (11) a d'abord pour enveloppe extérieure une surface cylindrique (S2), puis, en direction de la tranche d'extrémité (19) de ce fût creux (11), une surface conique (S3).7. Dowel screw according to any one of claims 1 to 6, characterized in that, from its head (16), the helical thread (15) of its hollow shaft (11) has first, for the outer envelope, a cylindrical surface (S2), then, in the direction of the end edge (19) of this hollow barrel (11), a conical surface (S3). 8. Vis-cheville suivant la revendication 7, caractérisée en ce que, la surface extérieure (14) de son fût creux (11) étant cylindrique dans sa partie courante, le diamètre (D2) de ladite surface cylindrique (S2) est sensiblement égal au double de celui (D1) de cette surface extérieure (14).8. Dowel screw according to claim 7, characterized in that, the external surface (14) of its hollow shaft (11) being cylindrical in its current part, the diameter (D2) of said cylindrical surface (S2) is substantially equal double that (D1) of this outer surface (14). 9. Vis-cheville suivant l'une quelconque des revendications 7, 8, caractérisée en ce que ladite surface cylindrique (S2) s'étend axialement sur au moins un pas (P) du filet (15) .9. Dowel screw according to any one of claims 7, 8, characterized in that said cylindrical surface (S2) extends axially over at least one pitch (P) of the thread (15). 10. Vis-cheville suivant l'une quelconque des revendications 7 à 9, caractérisée en ce que le demi-angle au sommet (A3) de ladite surface conique (S3) est de l'ordre de 10°.10. Dowel screw according to any one of claims 7 to 9, characterized in that the half-angle at the top (A3) of said conical surface (S3) is of the order of 10 °. 11. Vis-cheville suivant l'une quelconque des revendications 7 à 10, caractérisée en ce que, à son extrémité, le filet (15) de son fût creux (11) se raccorde sensiblement tangentiellement à la surface extérieure (14) de celui-ci.11. Dowel screw according to any one of claims 7 to 10, characterized in that, at its end, the thread (15) of its hollow shaft (11) is connected substantially tangentially to the outer surface (14) of that -this. 12. Vis-cheville suivant l'une quelconque des revendications 1 à 11, caractérisée en ce que le filet (15) de son fût creux (11) a une section axiale en forme de trapèze isocèle.12. Dowel screw according to any one of claims 1 to 11, characterized in that the thread (15) of its hollow shaft (11) has an axial section in the form of an isosceles trapezoid. 13. Vis-cheville suivant la revendication 12, caractérisée en ce que l'inclinaison (I), sur la médiane de l'ensemble, de chacun des côtés de la section axiale en trapèze isocèle du filet (15) de son fût creux (11) est de l'ordre de 20°.13. Ankle screw according to claim 12, characterized in that the inclination (I), on the median of the assembly, of each of the sides of the isosceles trapezoidal axial section of the thread (15) of its hollow shaft ( 11) is of the order of 20 °. 14. Vis-cheville suivant l'une quelconque des revendications 1 à 13, caractérisée en ce que, du côté de sa tête (16), la surface extérieure (14) de son fût creux (11), qui, par ailleurs, est cylindrique dans sa partie courante, va en s'évasant légèrement en direction de ladite tête (16).14. Dowel screw according to any one of claims 1 to 13, characterized in that, on the side of its head (16), the outer surface (14) of its hollow shaft (11), which, moreover, is cylindrical in its current part, tapering slightly towards said head (16). 15. Vis-cheville suivant l'une quelconque des revendications 1 à 14, caractérisée en ce que la surface inférieure (22) de sa tête (16) est plate.15. Dowel screw according to any one of claims 1 to 14, characterized in that the lower surface (22) of its head (16) is flat. 16. Vis-cheville suivant l'une quelconque des revendications 1 à 14, caractérisée en ce que la surface inférieure (22) de sa tête (16) est tronconique.16. Dowel screw according to any one of claims 1 to 14, characterized in that the lower surface (22) of its head (16) is frustoconical. 17. Vis-cheville suivant l'une quelconque des revendications 1 à 16, caractérisée en ce que la surface inférieure (22) de sa tête (16) présente en saillie au moins un ergot (40).17. Ankle screw according to any one of claims 1 to 16, characterized in that the lower surface (22) of its head (16) has projecting at least one lug (40). 18. Vis-cheville suivant l'une quelconque des revendications 1 à 17, caractérisée en ce que les moyens d'emboîtement (17) que présente sa tête (16) comportent deux ergots frangibles (18) disposés en positions diamétralement opposées l'un par rapport à l'autre.18. Dowel screw according to any one of claims 1 to 17, characterized in that the fitting means (17) that has its head (16) comprise two frangible pins (18) arranged in diametrically opposite positions one compared to each other. 19. Vis-cheville suivant la revendication 18, caractérisée en ce que les moyens d'emboîtement (17) que présente sa tête (16) comportent également une saignée diamétrale (25), en croix avec ses ergots frangibles (18).19. Ankle screw according to claim 18, characterized in that the fitting means (17) that has its head (16) also comprise a diametrical groove (25), crosswise with its frangible lugs (18). 20. Vis-cheville suivant l'une quelconque des revendications1 à 19, caractérisée en ce que la surface intérieure (12) de son fût creux (11) est cannelée.20. Anchor screw according to any one of claims1 to 19, characterized in that the inner surface (12) of its hollow shaft (11) is grooved. 21. Outil propre à la mise en oeuvre d'une vis-cheville conforme à l'une quelconque des revendications 1 à 20, caractérisé en ce qu'il comporte, en combinaison, d'une part, une tige (27), qui est propre à être engagée dans l'alésage interne du fût creux (11) d'une telle vis-cheville (10), et dont l'extrémité (28) comporte au moins un tranchant (29), et, d'autre part, disposé annulairement autour de ladite tige (26), un moyeu (32) présentant, sur sa tranche (33), au moins un évidement (35) par lequel il est apte à venir en prise avec un ergot frangible (18) de ladite vis-cheville (10).21. Tool specific to the implementation of a dowel screw according to any one of claims 1 to 20, characterized in that it comprises, in combination, on the one hand, a rod (27), which is suitable for being engaged in the internal bore of the hollow barrel (11) of such a dowel screw (10), and the end (28) of which comprises at least one cutting edge (29), and, on the other hand , arranged annularly around said rod (26), a hub (32) having, on its edge (33), at least one recess (35) by which it is able to engage with a frangible lug (18) of said ankle screw (10). 22. Outil suivant la revendication 21, caractérisé en ce que ledit évidement (35) s'étend suivant un secteur angulaire largement supérieur à celui suivant lequel s'étend un ergot frangible (18) de la vis-cheville (10).22. Tool according to claim 21, characterized in that said recess (35) extends along an angular sector greatly superior to that along which extends a frangible lug (18) of the ankle screw (10). 23. Outil suivant la revendication 21, caractérisé en ce que ledit évidement (35) se présente sous la forme d'une échancrure et s'étend suivant un secteur angulaire (A2) de l'ordre de 120°.23. Tool according to claim 21, characterized in that said recess (35) is in the form of a notch and extends along an angular sector (A2) of the order of 120 °. 24. Outil suivant l'une quelconque des revendications 21 à 23, caractérisé en ce que son moyeu (32) présente deux évidements (35) disposés en positions diamétralement opposées l'un par rapport à l'autre.24. Tool according to any one of claims 21 to 23, characterized in that its hub (32) has two recesses (35) arranged in diametrically opposite positions relative to each other. 25. Outil suivant l'une quelconque des revendications 21 à 24, caractérisé en ce que, formé à la faveur d'une double troncature de sa tige (27), le tranchant (29) de celle-ci s'étend suivant un angle (A4) de l'ordre de 30° par rapport à une normale à son axe.25. Tool according to any one of claims 21 to 24, characterized in that, formed by means of a double truncation of its rod (27), the cutting edge (29) thereof extends at an angle (A4) of the order of 30 ° relative to a normal to its axis. 26. Outil suivant l'une quelconque des revendications 21 à 25, caractérisé en ce que sa tige (27) présente deux tranchants (29) disposés en positions diamétralement opposées l'un par rapport à l'autre.26. Tool according to any one of claims 21 to 25, characterized in that its rod (27) has two cutting edges (29) arranged in diametrically opposite positions relative to each other. 27. Outil suivant l'une quelconque des revendications 21 à 26, caractérisé en ce que sa tige (27) et son moyeu (32) forment des pièces distinctes, dument emmanchées l'une avec l'autre.27. Tool according to any one of claims 21 to 26, characterized in that its rod (27) and its hub (32) form separate parts, duly fitted together.
EP19900402965 1989-10-25 1990-10-22 Screwplug, especially for soft material, and tool for installing the same Expired - Lifetime EP0425358B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8913982A FR2653503B1 (en) 1989-10-25 1989-10-25
FR8913982 1989-10-25

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EP0425358B1 EP0425358B1 (en) 1994-01-19

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EP19900402965 Expired - Lifetime EP0425358B1 (en) 1989-10-25 1990-10-22 Screwplug, especially for soft material, and tool for installing the same

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EP (1) EP0425358B1 (en)
JP (1) JP2781456B2 (en)
DE (1) DE69006170T2 (en)
ES (1) ES2048466T3 (en)
FR (1) FR2653503B1 (en)

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FR2670542A1 (en) * 1990-12-13 1992-06-19 Upat Max Langensiepen Kg METHOD AND DEVICE FOR FIXING AN OBJECT TO A WALL IN A LIGHTWEIGHT CONSTRUCTION MATERIAL.
EP0501201A1 (en) * 1991-02-28 1992-09-02 ALLFA DÜBEL GmbH Set of elements for screwing dowels into a porous material
GB2275979A (en) * 1993-03-09 1994-09-14 Cobra Marketing Limited Anchorage for screws in plasterboard
US5403137A (en) * 1990-12-13 1995-04-04 Upat Gmbh & Co. Process and device for attaching an object to a lightweight material wall
EP0831239A1 (en) * 1996-09-24 1998-03-25 Fischerwerke Arthur Fischer GmbH & Co. KG Cutting screw
EP0881400A1 (en) * 1997-05-26 1998-12-02 MiTek Industries GmbH Fastening screw, in particular tubular screw
FR2772090A1 (en) * 1997-12-05 1999-06-11 Legrand Sa Screw
FR2776034A1 (en) * 1998-03-16 1999-09-17 Spit Soc Prospect Inv Techn ANCHORING ANKLE FOR FRIABLE MATERIAL
EP1262668A1 (en) * 2001-05-25 2002-12-04 ALLFA DÜBEL GmbH Self-cutting dowel
EP1493929A1 (en) * 2003-07-03 2005-01-05 Turner Intellectual Property Limited Wall plug
WO2008012051A1 (en) * 2006-07-26 2008-01-31 Ejot Gmbh & Co. Kg Hole-forming and thread-forming screw
EP2584207A1 (en) * 2011-10-21 2013-04-24 Rockwool International A/S Device for fixing insulating layers and insulation assembly system
FR2981708A1 (en) * 2011-10-21 2013-04-26 Rockwool Int Fastening screw for fixing insulating panels used in insulation system for wall of building, has net extending over part of tip and body and including portion presenting truncated envelope, where pitch of net is greater than certain mm
WO2014076125A1 (en) * 2012-11-19 2014-05-22 Hilti Aktiengesellschaft Setting tool for drop-in anchor
GB2538636A (en) * 2016-05-26 2016-11-23 Uk Building Products Ltd A self-drilling drywall anchor and a method of securing an anchor in a drywall
US10933477B1 (en) * 2020-02-12 2021-03-02 Varun Jay Patel Wall magnet anchor system
US11076901B2 (en) 2017-04-21 2021-08-03 DePuy Synthes Products, Inc. Angled flutes in cannulated bone screws

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DE19717420A1 (en) * 1997-04-25 1998-10-29 Mungo Befestigungstech Ag Fixing device
DE29812947U1 (en) * 1998-07-21 1999-12-09 fischerwerke Artur Fischer GmbH & Co. KG, 72178 Waldachtal Screw-in dowels for soft building materials
DE19956906C2 (en) * 1999-11-26 2003-10-30 Tox Duebel Werk insulating plugs
ATE329163T1 (en) 2001-10-01 2006-06-15 Mungo Befestigungstech Ag SCREW DOWEL
DE102004021484B4 (en) * 2004-04-30 2018-11-29 Böllhoff Verbindungstechnik GmbH Method for producing a connection arrangement
US8057147B2 (en) 2008-07-03 2011-11-15 Illinois Tool Works Inc Self-drilling anchor
US7883307B2 (en) 2009-02-27 2011-02-08 Illinois Tool Works Inc. Self-drilling fastener
DE102016000088A1 (en) 2016-01-07 2017-07-13 Klaus Peter Abel Screw
DE102017101797A1 (en) 2017-01-31 2018-08-02 Fischerwerke Gmbh & Co. Kg Plasterboard dowels

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DE3311597A1 (en) * 1983-03-30 1984-10-04 Neucon Maschinen- Und Bausysteme Gmbh U. Co Kg, 7100 Heilbronn Step with a screw connection
EP0165674B1 (en) * 1984-05-11 1988-06-01 Illinois Tool Works Inc. Insert for a drywall

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LU68819A1 (en) * 1972-11-21 1974-01-21
US4109691A (en) * 1977-12-21 1978-08-29 Wilson Floyd Leroy Combination torque release screw and screw driver
DE3311597A1 (en) * 1983-03-30 1984-10-04 Neucon Maschinen- Und Bausysteme Gmbh U. Co Kg, 7100 Heilbronn Step with a screw connection
EP0165674B1 (en) * 1984-05-11 1988-06-01 Illinois Tool Works Inc. Insert for a drywall

Cited By (31)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2670542A1 (en) * 1990-12-13 1992-06-19 Upat Max Langensiepen Kg METHOD AND DEVICE FOR FIXING AN OBJECT TO A WALL IN A LIGHTWEIGHT CONSTRUCTION MATERIAL.
WO1992010687A1 (en) * 1990-12-13 1992-06-25 Upat Gmbh & Co. Method and device for attaching an object to a lightweight-construction wall
US5403137A (en) * 1990-12-13 1995-04-04 Upat Gmbh & Co. Process and device for attaching an object to a lightweight material wall
EP0501201A1 (en) * 1991-02-28 1992-09-02 ALLFA DÜBEL GmbH Set of elements for screwing dowels into a porous material
GB2275979A (en) * 1993-03-09 1994-09-14 Cobra Marketing Limited Anchorage for screws in plasterboard
GB2275979B (en) * 1993-03-09 1996-07-10 Cobra Marketing Limited Improvements in or relating to self-drilling anchorages
EP0831239A1 (en) * 1996-09-24 1998-03-25 Fischerwerke Arthur Fischer GmbH & Co. KG Cutting screw
EP0881400A1 (en) * 1997-05-26 1998-12-02 MiTek Industries GmbH Fastening screw, in particular tubular screw
FR2772090A1 (en) * 1997-12-05 1999-06-11 Legrand Sa Screw
FR2776034A1 (en) * 1998-03-16 1999-09-17 Spit Soc Prospect Inv Techn ANCHORING ANKLE FOR FRIABLE MATERIAL
EP0943822A1 (en) * 1998-03-16 1999-09-22 Societe De Prospection Et D'inventions Techniques Spit Anchoring dowel for brittle material
US6079921A (en) * 1998-03-16 2000-06-27 Societe De Prospection Et D'inventions Techniques Spit Anchor bolt for friable material
EP1262668A1 (en) * 2001-05-25 2002-12-04 ALLFA DÜBEL GmbH Self-cutting dowel
EP1493929A1 (en) * 2003-07-03 2005-01-05 Turner Intellectual Property Limited Wall plug
WO2008012051A1 (en) * 2006-07-26 2008-01-31 Ejot Gmbh & Co. Kg Hole-forming and thread-forming screw
EP2584207A1 (en) * 2011-10-21 2013-04-24 Rockwool International A/S Device for fixing insulating layers and insulation assembly system
WO2013056802A1 (en) * 2011-10-21 2013-04-25 Rockwool International A/S Device for fixing insulating layers and insulation assembly system
FR2981708A1 (en) * 2011-10-21 2013-04-26 Rockwool Int Fastening screw for fixing insulating panels used in insulation system for wall of building, has net extending over part of tip and body and including portion presenting truncated envelope, where pitch of net is greater than certain mm
US9249815B2 (en) 2011-10-21 2016-02-02 Rockwool International A/S Device for fixing insulating layers and insulation assembly system
WO2014076125A1 (en) * 2012-11-19 2014-05-22 Hilti Aktiengesellschaft Setting tool for drop-in anchor
CN104797383A (en) * 2012-11-19 2015-07-22 喜利得股份公司 Setting tool for drop-in anchor
CN104797383B (en) * 2012-11-19 2016-08-17 喜利得股份公司 Installation tool for percussive crab-bolt
US10780508B2 (en) 2012-11-19 2020-09-22 Hilti Aktiengesellschaft Setting tool for a drop-in anchor
GB2538636B (en) * 2016-05-26 2017-04-05 Uk Building Products Ltd A self-drilling drywall anchor and a method of securing an anchor in a drywall
US10344789B2 (en) 2016-05-26 2019-07-09 U.K. Building Products Ltd. Self-drilling drywall anchor and a method of securing an anchor in a drywall
GB2538636A (en) * 2016-05-26 2016-11-23 Uk Building Products Ltd A self-drilling drywall anchor and a method of securing an anchor in a drywall
US11076901B2 (en) 2017-04-21 2021-08-03 DePuy Synthes Products, Inc. Angled flutes in cannulated bone screws
US11751926B2 (en) 2017-04-21 2023-09-12 DePuy Synthes Products, Inc. Angled flutes in cannulated bone screws
US10933477B1 (en) * 2020-02-12 2021-03-02 Varun Jay Patel Wall magnet anchor system
CN113251052A (en) * 2020-02-12 2021-08-13 V·J·帕特尔 Wall magnet anchor system
US11542974B2 (en) 2020-02-12 2023-01-03 Varun Jay Patel Wall magnet anchor system

Also Published As

Publication number Publication date
JPH03153909A (en) 1991-07-01
FR2653503A1 (en) 1991-04-26
JP2781456B2 (en) 1998-07-30
DE69006170T2 (en) 1994-05-11
EP0425358B1 (en) 1994-01-19
ES2048466T3 (en) 1994-03-16
FR2653503B1 (en) 1992-01-24
DE69006170D1 (en) 1994-03-03

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